Try giving <link rel="stylesheet" href="./test.css" type="text/css" /> see the "./" or even test with the absolute path and see what is going wrong and step down to the actual path that is relative to the page requesting css.

Thats the way to specify the absolute URL but for relative one you can use "./" and "../" to achieve the same. You can check the source code of the current page and you will see the relative css is linked.